Automatic threading chuck



R. GILES ET AL AUTOMATIC THREADING CHUCK Filed July 30 Jan. 15, 1929.

o tained by means of Patented Jan. 15, 1929.

UNITED STATES PATENT OFFICE.

SIGNORS TO HAZEL-ATLAS GLASS C0.,

PORATION OF WEST VIRGINIA.

F WHEELING, WEST VIRGNIA, A COB- AUTOMATIC THREADING CHUCK.`

Application ledIuly 30, 1925. Serial No. 47,010. i

This invention relatesl to apparatus for cutting threads, either continuous or interrupted, and has special reference to a chuck for use in cutting such threads in molds employed in the manufacture of glassware such as j ars bottles and the like.

Prior to the present invention it has been the custom to cut threads in such molds by means of the ordinary lathe, but such method has proved unsatisfactory due to the fact that extreme exactitude was necessary in order that the molds should be uniformly cut. It is therefore anobject of the present invention to provide a mechanical attachnient for a milling machine by means of which the threads may be expeditiously and economically cut on a mold with great accuracy, and which will duplicate the threads on succeeding molds without variation.

Another object of the invention resides in the provision of such an attachment which will out threads on either cylindrical or tapered surfaces.

@ther objects and advantages of the invention will be apparent from the following description when taken in connection with the accompanying drawings, in which L Figure l is a fragmentary plan view of a milling machine with the attachment in place thereon, parts being broken away.

Figure Q is a fragmentary detail of the stop mechanism.

Figure 3 is a side elevation of the attachment, partly in section; and

`ffigure 1l is a side elevation of a detail.

More specifically, the numeral l indicates the bed of an ordinary milling machine provided with the T-head slots 2 to which is bolted the base plate 3 of the present invention.

The main or body portion of the threading chuck consists of a cylindrical casing or base portion l base plate 3 described.

for a purpose to be hereinafter This sliding connect-ion is atgrooves or slots 5 in opposite ends of the base plate which form guideways for the gibs 6 secured to the bottom of the casing Ll. y

Rotatably mountedon the upper edge of the casing Ll, and provided with a bearing ring T, is a head 8. This head is provided with an annular rib 9 on its upper face which which is slidably connected to the i is received in a complementar groove in the under surface of the work-ta le 10 and prevents lateral movement thereof while pern1itting circumferential adjustment of the worktable with respect to t-he head 8. A lock `11 1s provided for securing the table in adjusted position. y i

Depending centrally from the head 8 is a sleeve l2 to which is detachably connected by means of set screws 13 an internally threaded member la for cooperation with the externally threaded member l5.` `This threaded elenient l5 is detachably connectedto the casing l by means of` screwbolts 16. The purpose of this threaded connection between elements le and l5 is to cause the-wo1-ktable and the work carried thereby to rise as the table is rotated, thus causing the milling tool f 17 to cut a thread in the work corresponding to the pitch of the threaded members 14 and l5; and by providing detachable connections for these threaded members it will be apparent that other threaded elements having a different pitch may be substituted thus `varylng the pitch of the threadto be cut in the work.

A mold such as those for which the present invention is intended is indicated by the numeral 18. These molds comprise two hinged sections between which a bottom mold section is clamped when the mold is in use. In order to center this mold on the work-table the latter is provided with a central cavity 19 adapted to receive a boss 20 formed on the under surface of the disc 2l. A variety, of sizes of these discs may be kept in stoel!` to cooperate with various sizes of molds.` It will be understood, of course, that the molds are clamped about the disc. The work-table 10 is also provided with grooves 22 adapted to receive clamps (notshown) to assist in securing the work to the table. i

For the purpose of rotating the head 8 and table l() the sleeve 12 is provided with a worm c gear Q3 which meshes `with a worm 24 carried by the horizontally disposed shaft mounted in the eccentricall disposed bearing `26. This bearing is provic ed with a radially disposed handle 27 which extends through a slot `Q8 in the casing l, `and is-provided witha spring detent Q9 for locking engagement with the notches BO. By this construction it will be apparent that the worm may be locked either into or out ot' engagement With the Worm Wheel 23, as desired. In the position shown in F ig. l the Worm and Worm Wheel are in mesh, but it the handle 27 and eccentric hearing' 26 are given a partial turn it Will be apparent that the Worm 24 will be disengaged from the teeth 23. For the purpose olf rotating shaft 25 a pulley 25 is iiiedly connected thereto.

ln some classes of Work the molds are provided with continuous threads vvhile in other types interrupted threads are required. Accordingly, the periphery ot the \vorltable l0 is provided with graduations 3l trom Oo to 360 While the casing 4 has a pointer 32 tor cooperation therewith. By this means 'and with the employment ot a kneel-:out block carried by the table l() which is adapted to engage the release nut lever 34 of the milling machine, threads of various lengths may he cut as Will appear in the description of the operan tion found hereinafter. The s aecic structure of the nut lever 34 is not shown since per se it forms no part ot the present invention.

In certain types of glassware tight seals are required, and in such cases it is usual to taper that portion of the glassware on which the threads are formed. The present invention, therefore, has been designed to out threads on molds having tapered surfaces. To this end a spring pressed holt 35 is slidably mounted in the standard 3G `vhich is bolted to the milling machine and has its free end in engagement with the casing 4 thereby normally holding the casing 4 at one limit oll its movement in the slots 5. Also bolted to the milling machine at a point diametrically opposed to the spring bolt 35 is a standard 37 to Which is pivoted an arm 38 carrying a roller 39 which forms an abut-ment against which the ring 7 contacts When this part of the apparatus is in use. The arm 38 is provided with an extension 40 which is slotted and provided with graduations as in dicated by numerals 4l and 42 respectively. It will thus be observed that by adjusting' the slot with respect tothe set screw 43 the angle Which the roller 39 makes with the vertical may he varied so as to correspond with the taper of the mold Wall.

In the operation of this part of the invene tion just described it Will be apparentthat as the table is caused to rise, dueto the threaded elements 14 and l5, the ring` Will ride against the inclined roller 39 thus forcing the chuck 'to the left (Fig. 3) and permitting the milling tool to cut a thread oi' uniform depth on the tapered Wall of the mold. Y

Having described in detail the construction of the threading chu ch We will now proceed to set forth the operation thereof- Assun'iing that threaded elements l4`and l5 ot the proper `pitch have been placed in the chuck and turther assuming that it is desired to cut four interrupted threads-the mold i8 is clamped around a disc 2l ofproper size and which has been previously mounted on the Work-table 1G. Loch ll is now released and the table rotated until the O0 ot the graduations register with the pointer 32 and the table again locked to the head 8. rlhe knockout block 33 is thus positioned to contact with the release nut lever 34 at the proper time, and the handle 2? is swung so as to move the worm 24- into mesh with the Worm Wheel The cutting operation is nou' started and the table caused to rise, through the medium ot the threaded elements A and i5, as it is rotated. hitter the table has traveled through the linochout block 33 will engage the release nut lover 34 and further operation oit the milling tool is stopped. 'llhe handle 2.7 is new thrown over to disengage the worm 24 and the table is reversely rotated so to lo wer the same 'to the starting position. Lock ll 3 then loosened and the table lllrota'icd so as to bring the 900 graduation into registration with the pointer Blandthe Ya'orl:-tahlea ain loclred. 'llhemachine is than again set in operation as beilore and these operations are repeated until all ot the threads are cut. lt ivill be understood, ot course, that the length ot the threads and their number may he varied as desired. lt, :tor instance, only three threads were required the table could be set at (lo, D and 2400.

ln the foregoing operation ot the machine' it was assumed that the mold had a cylindrical interior ot uniform diameter and the ab ut ment or roller 39 theretore vvas unnecessary and could he swung to one side and secured by means of the adjustn'ient Villiers threads are to be placed on a tapered srrtace however, the roller is adjusted to a position having an angle with the vertical equal to the taperon the mold. rllhe machine is then operated as above described and due to the roller 235) the Work is moved to the left E) against the pressure oit plunger 35. thus causing the milling machine to cut a thread ol" uniform dep th on the tapered surface.

F rom the foregoing description connection with the accoinpauvlA ,g i it ivill be apparent that we have da 7 attachment ttor ordinary milliu 'r which adapts the same to out citi ons or. interrupted threads unen f" or inclined surfaces; tliat threads to be cut may be ea; i varied by merely substituting other masts threads for those previously7 attached to the chuck; and that such threads may be duiifgfated on a plurality ot molds Without vl 'lfhc attachment is there'tore especially useful in connection with forming oit threads on molds ior glassware and the like Where a high degrec of exactitude and unitorinity ol the utmost importance; although obviously it may be used for a variety ot purposes.

ln accordance with the patent statutes we have described ,rnat- We nou' believe to he the best embodiment ot the invention, but We do .rinflria tue pitch ot the ll tl liu! lill) not Wish to oe understood thereby as limiting ourselves or the scope of the invention, as many changes and modifications may be made Without departing from the spirit olf the invention; all such we aim to include in the scope of the appended claims.

Vli at We claim as new and desire to secure by Letters Patent l. A threading chuck for milling machines including a hase portion, a head, a Work-table mounted on said head against axial movement with respect thereto but lor circumferential adj netment, releasalile means for locking said Work-table with respect to said head, said ivorlr-tahle and head provided with graduations, a pointer on said hase portion for cooperation with said graduations, and cooperating threaded velements tor causing a rectilinear movement of the Work-table and head as the same are rotated.

2. A threading chuck for milling machines including a slidably-mounted hase portion, a work-table threaded thereto, means for rotating said table, means normally holding said base portion at one limit ot its sliding movement, means for causing said baseportion to move toward its other limit ot' movement as t-he Work-table is rotated, and means for varying the extent of said movement.

8. A threading chuck tor milling machines including a slidahly-mounted base portion, a Work-table threaded thereto, means for rotating said table, a spring-pressed plunger engaging said base portion and normally holding said base portion at one limit of its sliding movement, means for causing said hase portion to move toward its other limit of movement as the Work-table is rotated, and means for varying the extent of said movement.

4L. A threading chuck for milling machines including a slidably-mounted base portion, a work-table threaded thereto, means for rotating said table, a spring-pressed plunger engaging said base portion and normally holding said base portion at one limit of its movement, and an inclined abut-ment bearing on said Work-table and adapted to cause a sliding movement thereof as the table is rotated.

5. `A threading chuck ormilling machines including a slidably-mounted base portion, a Work-table threaded thereto, means for rotating said table, means normally holding said hase portion at one limit of its sliding movement, and a rotatably-mounted roller having bearing on the side of said table and inclined with respect thereto.

6. A threading chuck for milling machines including a slidably-mounted base portion, a Work-table threaded thereto, means for rotating said table, means normally holding said base portion at one limit of its sliding movement, an arm pivoted adjacent said table, a roller carried by said arm and bearing on the periphery of said table, and means for positioning said roller at varyirfg angles With the vertical.

7 A threading chuck for milling machines including a plate, a casing slidably-mounted thereon, a head threaded to said casing, a Work-table mounted for circumferential adjustment on said head, means for rotating said head comprising a Worm Wheel on said head and a Worm meshing with said Worin wheel, an eccentric bearing for said Worm, and means for adjusting said bearing to move said Worm into and ont of engagement with said Worm gear. y.

S. A threading chuck for milling machines adapted to hold a partible glass mold and including rotatable Work-table having grooves for the reception of clamping elements, and a disc detachably secured centrally of said Work table and around which the mold is clamped by the clampino' elements.

9. A threading chuck including a. slidably-mounted base portion,` a head rotatably mounted on said base portion, a Work-table mounted on said head against axial movement and provided with a series of graduations, said Work-table being circumferentially adjustable with respect to said head,

means for rotating said head and Work-table, and cooperating threaded elements detachably connected to said base portion and head, whereby other threaded elements having single or multiple threads of varying pitch may be substituted.

10. A threading chuck for milling machines including a base portion, a head rotatably mounted on said base portion, an unthreadcd for milling machines Work-table mounted on said head for circum- REED GILEs. Roer. MGWILLIAMs. 

